Three-piece compact optical lens system

ABSTRACT

A three-piece compact optical lens system includes, in order from the object side to the image side: a flat panel assembly made of glass, a first lens element with a negative refractive power having an object-side surface being concave near an optical axis; a stop; a second lens element with a positive refractive power having an object-side surface being convex near the optical axis and an image-side surface being convex near the optical axis; and a third lens element with a positive refractive power. Such a system can not only effectively collect light at a large angle, receive a wider range of images and achieve identification effects within very short distances, but also can reduce the distance between an object and the three-piece compact optical lens system, reduce the volume effectively and maintain its miniaturization.

BACKGROUND Field of the Invention

The present invention relates to a lens system, and more particularly toa three-piece compact optical lens system applicable to electronicproducts.

Description of the Prior Art

The biometric identification (biometric) system based on the uniquebiometric characteristics of each organism, because of its uniqueness,universality, permanence, testability, convenience, acceptability, andimpermissibility, it is often used in existing mobile devices on thecurrent market, or even in future electronic devices. However, atpresent, the biometric identification system used in mobile devices isbased on the principle of capacitance. Although it can reduce therequired volume of the biometric identification system, the circuitstructure is too complex, which makes the manufacturing cost too high,and the relative unit price of the product is also higher.

Although there are traditional biometric identification systems usingoptical imaging principles, such as fingerprint identification, veinidentification and so on, the traditional biometric identificationsystems have the problem of too large volume, which makes it difficultto miniaturize the electronic devices equipped with the biometricidentification systems, and it is also harder to carry.

The present invention mitigates and/or obviates the aforementioneddisadvantages.

SUMMARY

The primary objective of the present invention is to provide athree-piece compact optical lens system which can reduce the distancebetween an object and the three-piece compact optical lens system,reduce the volume effectively, and maintain its miniaturization.

Another objective of the present invention is to provide a three-piececompact optical lens system which can effectively collect light at alarge angle, receive a wider range of images and achieve identificationeffects within very short distances.

Therefore, a three-piece compact optical lens system in accordance withthe present invention comprises, in order from an object side to animage side: a flat panel made of glass; a first lens element with anegative refractive power having an object-side surface being concavenear an optical axis, at least one of the object-side surface and animage-side surface of the first lens element being aspheric; a stop; asecond lens element with a positive refractive power having anobject-side surface being convex near the optical axis and an image-sidesurface being convex near the optical axis, at least one of theobject-side surface and the image-side surface of the second lenselement being aspheric; and a third lens element with a positiverefractive power, at least one of an object-side surface and animage-side surface of the third lens element being aspheric.

Wherein the three-piece compact optical lens system has a total of threelens elements with refractive power, the three-piece compact opticallens system has a maximum view angle FOV, a distance from an object toan image plane along the optical axis is OTL, a focal length of thethree-piece compact optical lens system is f, a focal length of thefirst lens element is f1, a focal length of the second lens element isf2, a focal length of the third lens element is f3, and they satisfy therelations: 90 degrees<FOV<140 degrees; 2 mm<OTL<6 mm;0.2<|f/(f1*f2*f3)|<0.7.

Preferably, the focal length of the three-piece compact optical lenssystem is f, the focal length of the first lens element is f1, and theysatisfy the relation: −0.7<f/f1<−0.1, so that the refractive power ofthe three-piece compact optical lens system can be balanced, so as tocorrect the aberration of the three-piece compact optical lens systemeffectively and reduce the sensitivity of the three-piece compactoptical lens system.

Preferably, the focal length of the three-piece compact optical lenssystem is f, the focal length of the second lens element is f2, and theysatisfy the relation: 0.1<f/f2<0.75, so that the refractive power of thethree-piece compact optical lens system can be balanced, so as tocorrect the aberration of the three-piece compact optical lens systemeffectively and reduce the sensitivity of the three-piece compactoptical lens system.

Preferably, the focal length of the three-piece compact optical lenssystem is f, the focal length of the third lens element is f3, and theysatisfy the relation: 0.07<f/f3<0.68, so that the refractive power ofthe three-piece compact optical lens system can be balanced, so as tocorrect the aberration of the three-piece compact optical lens systemeffectively and reduce the sensitivity of the three-piece compactoptical lens system.

Preferably, the focal length of the three-piece compact optical lenssystem is f, a focal length of the second lens element and the thirdlens element combined is f23, and they satisfy the relation:0.4<f/f23<1.0, so that the shortening of the total length of the systemand the correction of aberration can be balanced.

Preferably, the focal length of the first lens element is f1, the focallength of the second lens element and the third lens element combined isf23, and they satisfy the relation: −2.9<f1/f23<−1.0, so that theresolution can be improved evidently.

Preferably, the focal length of the first lens element is f1, a radiusof curvature of the object-side surface of the first lens element is R1,and they satisfy the relation: 0.6<f1/R1<2.4, which can reduce thedistortion.

Preferably, the focal length of the first lens element is f1, a radiusof curvature of the image-side surface of the first lens element is R2,and they satisfy the relation: −1.0<f1/R2<0.6, so that the curvature ofthe image-side surface of the first lens element will be appropriate, itwill be favorable to reduce the total length of the three-piece compactoptical lens system.

Preferably, the focal length of the second lens element is f2, a radiusof curvature of the object-side surface of the second lens element isR3, and they satisfy the relation: 0.2<f2/R3<1.6, it will be favorableto reduce the sensitivity of the system, effectively improving the yieldof production.

Preferably, the focal length of the second lens element is f2, a radiusof curvature of the image-side surface of the second lens element is R4,and they satisfy the relation: −1.8<f2/R4<−0.4, so that it can furtherreduce the peripheral curvature of the image-side surface of the secondlens element, and realize the characteristic of reducing stray light.

Preferably, the focal length of the third lens element is f3, a radiusof curvature of the object-side surface of the third lens element is R5,and they satisfy the relation: −0.7<f3/R5<2.7, so that the magnificationof imaging is corrected.

Preferably, the focal length of the third lens element is f3, a radiusof curvature of the image-side surface of the third lens element is R6,and they satisfy the relation: −2.1<f3/R6<1.0, so that the magnificationof imaging is corrected.

Preferably, the radius of curvature of the object-side surface of thefirst lens element is R1, the radius of curvature of the image-sidesurface of the first lens element is R2, and they satisfy the relation:−0.9<R1/R2<0.6, so that the spherical aberration and astigmatism of thethree-piece compact optical lens system can be reduced.

Preferably, the radius of curvature of the object-side surface of thesecond lens element is R3, the radius of curvature of the image-sidesurface of the second lens element is R4, and they satisfy the relation:−3.2<R3/R4<−0.1, so that the astigmatism of the three-piece compactoptical lens system can be reduced.

Preferably, the radius of curvature of the object-side surface of thethird lens element is R5, the radius of curvature of the image-sidesurface of the third lens element is R6, and they satisfy the relation:−95<R5/R6<10, so that the curvature configuration of the surfaces of thethird lens element can be balanced effectively, so as to balance thefield of view with the total track length.

Preferably, the focal length of the three-piece compact optical lenssystem is f, the distance from the object to the image plane along theoptical axis is OTL, and they satisfy the relation: 8.0<OTL/f<18.0, itwill be favorable to maintain the objective of miniaturization and longfocus of the three-piece compact optical lens system, which can be usedin thin electronic products.

Preferably, the focal length of the first lens element is f1, the focallength of the second lens element is f2, the focal length of the thirdlens element is f3, and they satisfy the relation:−2.4<(f1+f2+f3)/(f1*f2*f3)<−0.1, so that the object can be well imagedon the image plane with small aberration and high relative illuminationon the short object distance.

The present invention will be presented in further details from thefollowing descriptions with the accompanying drawings, which show, forpurpose of illustrations only, the preferred embodiments in accordancewith the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A shows a three-piece compact optical lens system in accordancewith a first embodiment of the present invention;

FIG. 1B is a partial enlarged view of FIG. 1A;

FIG. 1C shows the image plane curve and the distortion curve of thefirst embodiment of the present invention;

FIG. 2A shows a three-piece compact optical lens system in accordancewith a second embodiment of the present invention;

FIG. 2B is a partial enlarged view of FIG. 2A;

FIG. 2C shows the image plane curve and the distortion curve of thesecond embodiment of the present invention;

FIG. 3A shows a three-piece compact optical lens system in accordancewith a third embodiment of the present invention;

FIG. 3B is a partial enlarged view of FIG. 3A;

FIG. 3C shows the image plane curve and the distortion curve of thethird embodiment of the present invention;

FIG. 4A shows a three-piece compact optical lens system in accordancewith a fourth embodiment of the present invention;

FIG. 4B is a partial enlarged view of FIG. 4A;

FIG. 4C shows the image plane curve and the distortion curve of thefourth embodiment of the present invention;

FIG. 5A shows a three-piece compact optical lens system in accordancewith a fifth embodiment of the present invention;

FIG. 5B is a partial enlarged view of FIG. 5A;

FIG. 5C shows the image plane curve and the distortion curve of thefifth embodiment of the present invention;

FIG. 6A shows a three-piece compact optical lens system in accordancewith a sixth embodiment of the present invention;

FIG. 6B is a partial enlarged view of FIG. 6A;

FIG. 6C shows the image plane curve and the distortion curve of thesixth embodiment of the present invention;

FIG. 7A shows a three-piece compact optical lens system in accordancewith a seventh embodiment of the present invention;

FIG. 7B is a partial enlarged view of FIG. 7A;

FIG. 7C shows the image plane curve and the distortion curve of theseventh embodiment of the present invention;

FIG. 8A shows a three-piece compact optical lens system in accordancewith an eighth embodiment of the present invention;

FIG. 8B is a partial enlarged view of FIG. 8A; and

FIG. 8C shows the image plane curve and the distortion curve of theeighth embodiment of the present invention.

DETAILED DESCRIPTION

Referring to FIGS. 1A, 1B and FIG. 1C, FIG. 1A shows a three-piececompact optical lens system in accordance with a first embodiment of thepresent invention, FIG. 1B is a partial enlarged view of FIG. 1A, andFIG. 1C shows, in order from left to right, the image plane curve andthe distortion curve of the first embodiment of the present invention. Athree-piece compact optical lens system in accordance with the firstembodiment of the present invention comprises, in order from an objectside to an image side: a flat panel 160, a first lens element 110, astop 100, a second lens element 120, a third lens element 130, an IR cutfilter 170, and an image plane 180, wherein the three-piece compactoptical lens system has a total of three lens elements with refractivepower. The stop 100 is disposed between the first lens element 110 andthe second lens element 120.

The flat panel 160 made of glass is located between an object O and thefirst lens element 110 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 110 with a negative refractive power has anobject-side surface 111 being concave near an optical axis 190 and animage-side

$z = {\begin{matrix}{ch}^{2} \\{1 + \lbrack {1 - {( {k + 1} )c^{2}h^{2}}} \rbrack^{0.5}}\end{matrix} + {Ah}^{4} + {Bh}^{6} + {Ch}^{8} + {Dh}^{10} + {Eh}^{12} + {Fh}^{14} + {{Gh}^{16}\mspace{14mu} \ldots}}$

surface 112 being convex near the optical axis 190, the object-sidesurface 111 and the image-side surface 112 are aspheric, and the firstlens element 110 is made of plastic material.

The second lens element 120 with a positive refractive power has anobject-side surface 121 being convex near the optical axis 190 and animage-side surface 122 being convex near the optical axis 190, theobject-side surface 121 and the image-side surface 122 are aspheric, andthe second lens element 120 is made of plastic material.

The third lens element 130 with a positive refractive power has anobject-side surface 131 being convex near the optical axis 190 and animage-side surface 132 being convex near the optical axis 190, theobject-side surface 131 and the image-side surface 132 are aspheric, andthe third lens element 130 is made of plastic material.

The IR cut filter 170 made of glass is located between the third lenselement 130 and the image plane 180 and has no influence on the focallength of the three-piece compact optical lens system.

The equation for the aspheric surface profiles of the respective lenselements of the first embodiment is expressed as follows:

wherein:

z represents the value of a reference position with respect to a vertexof the surface of a lens and a position with a height h along theoptical axis 190;

c represents a paraxial curvature equal to 1/R (R: a paraxial radius ofcurvature);

h represents a vertical distance from the point on the curve of theaspheric surface to the optical axis 190;

k represents the conic constant;

A, B, C, D, E, F, G, . . . : present the high-order asphericcoefficients.

In the first embodiment of the three-piece compact optical lens system,a focal length of the three-piece compact optical lens system is f, af-number of the three-piece compact optical lens system is Fno, thethree-piece compact optical lens system has a maximum view angle (fieldof view) FOV, and they satisfy the relations: f=0.37 mm; Fno=1.35; andFOV=105.0 degrees.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the three-piece compact optical lens systemis f, a focal length of the first lens element 110 is f1, a focal lengthof the second lens element 120 is f2, a focal length of the third lenselement 130 is f3, and they satisfy the relation: |f/(f1*f2*f3)|=0.38.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the three-piece compact optical lens systemis f, the focal length of the first lens element 110 is f1, and theysatisfy the relation: f/f1=−0.32.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the three-piece compact optical lens systemis f, the focal length of the second lens element 120 is f2, and theysatisfy the relation: f/f2=0.53.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the three-piece compact optical lens systemis f, the focal length of the third lens element 130 is f3, and theysatisfy the relation: f/f3=0.32.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the three-piece compact optical lens systemis f, a focal length of the second lens element 120 and the third lenselement 130 combined is f23, and they satisfy the relation: f/f23=0.75.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the first lens element 110 is f1, the focallength of the second lens element 120 and the third lens element 130combined is f23, and they satisfy the relation: f1/f23=−2.38.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the first lens element 110 is f1, a radiusof curvature of the object-side surface 111 of the first lens element110 is R1, and they satisfy the relation: f1/R1=1.86.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the first lens element 110 is f1, a radiusof curvature of the image-side surface 112 of the first lens element 110is R2, and they satisfy the relation: f1/R2=0.02.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the second lens element 120 is f2, a radiusof curvature of the object-side surface 121 of the second lens element120 is R3, and they satisfy the relation: f2/R3=0.83.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the second lens element 120 is f2, a radiusof curvature of the image-side surface 122 of the second lens element120 is R4, and they satisfy the relation: f2/R4=−1.19.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the third lens element 130 is f3, a radiusof curvature of the object-side surface 131 of the third lens element130 is R5, and they satisfy the relation: f3/R5=0.86.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the third lens element 130 is f3, a radiusof curvature of the image-side surface 132 of the second lens element130 is R6, and they satisfy the relation: f3/R6=−0.75.

In the first embodiment of the present three-piece compact optical lenssystem, the radius of curvature of the object-side surface 111 of thefirst lens element 110 is R1, the radius of curvature of the image-sidesurface 112 of the first lens element 110 is R2, and they satisfy therelation: R1/R2=0.01.

In the first embodiment of the present three-piece compact optical lenssystem, the radius of curvature of the object-side surface 121 of thesecond lens element 120 is R3, the radius of curvature of the image-sidesurface 122 of the second lens element 120 is R4, and they satisfy therelation: R3/R4=−1.42.

In the first embodiment of the present three-piece compact optical lenssystem, the radius of curvature of the object-side surface 131 of thethird lens element 130 is R5, the radius of curvature of the image-sidesurface 132 of the third lens element 130 is R6, and they satisfy therelation: R5/R6=−0.86.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the compact optical lens system is f, adistance from the object O to the image plane 180 along the optical axis190 is OTL, and they satisfy the relation: OTL/f=13.30.

In the first embodiment of the present three-piece compact optical lenssystem, the focal length of the first lens element 110 is f1, the focallength of the second lens element 120 is f2, the focal length of thethird lens element 130 is f3, and they satisfy the relation:(f1+f2+f3)/(f1*f2*f3)=−0.70.

The detailed optical data of the first embodiment is shown in table 1,and the aspheric surface data is shown in table 2.

TABLE 1 Embodiment 1 f(focal length) = 0.37 mm, Fno = 1.35, FOV = 105deg. sur- Curvature Thick- Ma- In- Abbe Focal face Radius ness terialdex # length 0 object infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.476 3 Lens 1  −0.638 (ASP) 0.392 plastic 1.54 56−1.19 4 −59.893 (ASP) 0.379 5 stop infinity 0.005 6 Lens 2  0.848 (ASP)0.377 plastic 1.54 56  0.71 7 −0.596 (ASP) 0.034 8 Lens 3  1.354 (ASP)0.244 plastic 1.64 22.5  1.17 9 −1.566 (ASP) 0.361 10 IR- infinity 0.210glass 1.52 54.5 filter 11 infinity infinity 12 Image infinity 0.000plane

TABLE 2 Aspheric Coefficients surface 3 4 6 7 8 9 K: −6.6639E+00−4.0007E+02 −4.6984E+01 8.6056E−01 −2.6278E+01 −8.7212E+01 A: 2.1335E+006.6209E+00 4.6884E+00 −4.1935E+02 1.0201E+00 2.1905E+00 B: −6.7124E+0011.143E+00 −6.7574E+01 −3.9365E+01 −4.6967E+01 −2.9033E+01 C: 1.5008E+012.8583E+02 −4.1183E+02 2.2458E+02 1.3049E+02 1.3825E+01 D: −1.8686E+01−2.6398E+03 1.0258E+04 6.2920E+02 9.5193E+02 4.1848E+02 E: 8.7309E+00−1.3663E+04 8.5885E+04 3.3069E+02 −4.2474E+02 4.3534E+03 F 4.9937E+002.4599E+05 −1.9343E+06 −6.1268E+04 −7.4096E+04 −4.8409E+04 G −5.1320E+005.4409E+03 6.9233E+06 2.1063E+05 2.9197E+05 1.1285E+05

The units of the radius of curvature, the thickness and the focal lengthin table 1 are expressed in mm, the surface numbers 0-12 represent thesurfaces sequentially arranged from the object-side to the image-sidealong the optical axis. In table 2, k represents the conic coefficientof the equation of the aspheric surface profiles, and A, B, C, D, E, F,G . . . : represent the high-order aspheric coefficients. The tablespresented below for each embodiment are the corresponding schematicparameter, image plane curves and distortion curves, and the definitionsof the tables are the same as Table 1 and Table 2 of the firstembodiment. Therefore, an explanation in this regard will not beprovided again.

Referring to FIGS. 2A, 2B and FIG. 2C, FIG. 2A shows a three-piececompact optical lens system in accordance with a second embodiment ofthe present invention, FIG. 2B is a partial enlarged view of FIG. 2A,and FIG. 2C shows, in order from left to right, the image plane curveand the distortion curve of the second embodiment of the presentinvention. A three-piece compact optical lens system in accordance withthe second embodiment of the present invention comprises, in order froman object side to an image side: a flat panel 260, a first lens element210, a stop 200, a second lens element 220, a third lens element 230, anIR cut filter 270, and an image plane 280, wherein the three-piececompact optical lens system has a total of three lens elements withrefractive power. The stop 200 is disposed between the first lenselement 210 and the second lens element 220.

The flat panel 260 made of glass is located between an object O and thefirst lens element 210 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 210 with a negative refractive power has anobject-side surface 211 being concave near an optical axis 290 and animage-side surface 212 being convex near the optical axis 290, theobject-side surface 211 and the image-side surface 212 are aspheric, andthe first lens element 210 is made of plastic material.

The second lens element 220 with a positive refractive power has anobject-side surface 221 being convex near the optical axis 290 and animage-side surface 222 being convex near the optical axis 290, theobject-side surface 221 and the image-side surface 222 are aspheric, andthe second lens element 220 is made of plastic material.

The third lens element 230 with a positive refractive power has anobject-side surface 231 being convex near the optical axis 290 and animage-side surface 232 being convex near the optical axis 290, theobject-side surface 231 and the image-side surface 232 are aspheric, andthe third lens element 230 is made of plastic material.

The IR cut filter 270 made of glass is located between the third lenselement 230 and the image plane 280 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the second embodiment is shown in table 3,and the aspheric surface data is shown in table 4.

TABLE 3 Embodiment 2 f(focal length) = 0.38 mm, Fno = 1.40, FOV = 109.2deg. Focal surface Curvature Radius Thickness Material Index Abbe #length 0 object infinity 0.000 1 flat panel infinity 1.500 glass 1.5264.2 2 infinity 1.308 3 Lens 1 −0.593 (ASP) 0.384 plastic .54 56 −1.10 4−100.001 (ASP) 0.370 5 stop infinity 0.008 6 Lens 2 0.923 (ASP) 0.427plastic 1.54 56 0.74 7 −0.593 (ASP) 0.030 8 Lens 3 1.341 (ASP) 0.247plastic 1.64 22.5 1.21 9 −1.703 (ASP) 0.379 10  IR-filter infinity 0.210glass 1.52 54.5 11  infinity infinity 12  Image infinity 0.000 plane

TABLE 4 Aspheric Coefficients surface 3 4 6 7 8 9 K: −6.4918E+00−3.9992E+02 −4.9131E+01 8.9612E−01 −1.5246E+01 −8.1551E+01 A: 2.1426E+007.9165E+00 4.7911E+00 −1.2361E−01 1.0724E+00 2.2809E+00 B: −6.7444E+002.1246E+00 −6.7622E+01 −3.9616E+01 −4.7639E+01 −2.8547E+01 C: 1.4949E+012.5606E+02 −4.2869E+02 2.2480E+02 1.2582E+02 1.5003E+01 D: −1.8735E+01−2.7263E+03 9.9086E+03 6.1759E+02 9.3780E+02 4.1861E+02 E: 8.6996E+00−1.4381E+04 8.2215E+04 1.0358E+02 −4.5273E+02 4.3494E+03 F 5.0113E+002.3365E+05 −1.9549E+06 −6.2854E+04 −7.4033E+04 −4.8444E+04 G −5.0411E+00−1.9075E+05 6.7066E+06 1.9852E+05 2.9307E+05 1.1268E+05

In the second embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the second embodiment, so an explanationin this regard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

Embodiment 2 f[mm] 0.38 f1/R2 0.01 Fno 1.40 f2/R3 0.80 FOV[deg.] 109.20f2/R4 −1.24 |f/(f1 * f2 * f3)| 0.39 f3/R5 0.90 f/f1 −0.35 f3/R6 −0.71f/f2 0.51 R1/R2 0.01 f/f3 0.31 R3/R4 −1.55 f/f23 0.74 R5/R6 −0.79 f1/f23−2.13 OTL/f 12.84 f1/R1 1.85 (f1 + f2 + f3)/(f1 * f2 * f3) −0.87

Referring to FIGS. 3A, 3B and FIG. 3C, FIG. 3A shows a three-piececompact optical lens system in accordance with a third embodiment of thepresent invention, FIG. 3B is a partial enlarged view of FIG. 3A, andFIG. 3C shows, in order from left to right, the image plane curve andthe distortion curve of the third embodiment of the present invention. Athree-piece compact optical lens system in accordance with the thirdembodiment of the present invention comprises, in order from an objectside to an image side: a flat panel 360, a first lens element 310, astop 300, a second lens element 320, a third lens element 330, an IR cutfilter 370, and an image plane 380, wherein the three-piece compactoptical lens system has a total of three lens elements with refractivepower. The stop 300 is disposed between the first lens element 310 andthe second lens element 320.

The flat panel 360 made of glass is located between an object O and thefirst lens element 310 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 310 with a negative refractive power has anobject-side surface 311 being concave near an optical axis 390 and animage-side surface 312 being concave near the optical axis 390, theobject-side surface 311 and the image-side surface 312 are aspheric, andthe first lens element 310 is made of plastic material.

The second lens element 320 with a positive refractive power has anobject-side surface 321 being convex near the optical axis 390 and animage-side surface 322 being convex near the optical axis 390, theobject-side surface 321 and the image-side surface 322 are aspheric, andthe second lens element 320 is made of plastic material.

The third lens element 330 with a positive refractive power has anobject-side surface 331 being convex near the optical axis 390 and animage-side surface 332 being convex near the optical axis 390, theobject-side surface 331 and the image-side surface 332 are aspheric, andthe third lens element 330 is made of plastic material.

The IR cut filter 370 made of glass is located between the third lenselement 330 and the image plane 380 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the third embodiment is shown in table 5,and the aspheric surface data is shown in table 6.

TABLE 5 Embodiment 3 f(focal length) = 0.36 mm, Fno = 1.30, FOV = 114.6deg. sur- Curvature Thick- Mat- In- Abbe Focal face Radius ness erialdex # length 0 object infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.186 3 Lens 1 −0.556 (ASP) 0.367 plastic 1.54 56−0.81 4 2.575 (ASP) 0.401 5 stop infinity 0.001 6 Lens 2 0.795 (ASP)0.502 plastic 1.54 56 0.73 7 −0.615 (ASP) 0.031 8 Lens 3 1.048 (ASP)0.243 plastuc 1.54 56 1.29 9 −1.945 (ASP) 0.409 10  IR- infinity 0.210glass 1.52 54.5 filter 11  infinity infinity 12  Image infinity 0.000plane

TABLE 6 Aspheric Coefficients surface 3 4 6 7 8 9 K: −8.0024E+00−1.9774E+01 −4.7139E+01 9.2121E−01 −1.1890E+01 −4.5548E+01 A: 2.1115E+001.0690E+01 5.7393E+00 4.5153E−01 1.2507E+00 2.5234E+00 B: −6.7769E+00−1.0853E+01 −6.5651E+01 −4.0583E+01 −4.7072E+01 −2.8089E+01 C:1.4913E+01 2.0963E+02 −4.8839E+02 2.1330E+02 1.2716E+02 1.5595E+01 D:−1.8780E+01 −2.4878E+03 9.0215E+03 5.8070E+02 9.3021E+02 4.2480E+02 E:8.6506E+00 −1.0689E+04 7.635415E+04 8.6568E+01 −5.9265E+02 4.3670E+03 F5.0120E+00 2.4047E+05 −1.9212E+06 −6.1195E+04 −7.5340E+04 −4.8618+04 G−4.9036E+00 −5.1120E+05 8.5642E+06 2.1358E+05 2.8301E+05 1.1002E+05

In the third embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the third embodiment, so an explanation inthis regard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

Embodiment 3 f[mm] 0.36 f1/R2 −0.31 Fno 1.30 f2/R3 0.92 FOV[deg.] 114.60f2/R4 −1.18 |f/(f1 * f2 * f3)| 0.48 f3/R5 1.23 f/f1 −0.45 f3/R6 −0.66f/f2 0.50 R1/R2 −0.22 f/f3 0.28 R3/R4 −1.29 f/f23 0.68 R5/R6 −0.54f1/f23 −1.52 OTL/f 13.35 f1/R1 1.45 (f1 + f2 + f3)/(f1 * f2 * f3) −1.60

Referring to FIGS. 4A, 4B and FIG. 4C, FIG. 4A shows a three-piececompact optical lens system in accordance with a fourth embodiment ofthe present invention, FIG. 4B is a partial enlarged view of FIG. 4A,and FIG. 4C shows, in order from left to right, the image plane curveand the distortion curve of the fourth embodiment of the presentinvention. A three-piece compact optical lens system in accordance withthe fourth embodiment of the present invention comprises, in order froman object side to an image side: a flat panel 460, a first lens element410, a stop 400, a second lens element 420, a third lens element 430, anIR cut filter 470, and an image plane 480, wherein the three-piececompact optical lens system has a total of three lens elements withrefractive power. The stop 400 is disposed between the first lenselement 410 and the second lens element 420.

The flat panel 460 made of glass is located between an object O and thefirst lens element 410 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 410 with a negative refractive power has anobject-side surface 411 being concave near an optical axis 490 and animage-side surface 412 being concave near the optical axis 490, theobject-side surface 411 and the image-side surface 412 are aspheric, andthe first lens element 410 is made of plastic material.

The second lens element 420 with a positive refractive power has anobject-side surface 421 being convex near the optical axis 490 and animage-side surface 422 being convex near the optical axis 490, theobject-side surface 421 and the image-side surface 422 are aspheric, andthe second lens element 420 is made of plastic material.

The third lens element 430 with a positive refractive power has anobject-side surface 431 being convex near the optical axis 490 and animage-side surface 432 being convex near the optical axis 490, theobject-side surface 431 and the image-side surface 432 are aspheric, andthe third lens element 430 is made of plastic material.

The IR cut filter 470 made of glass is located between the third lenselement 430 and the image plane 480 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the fourth embodiment is shown in table 7,and the aspheric surface data is shown in table 8.

TABLE 7 Embodiment 4 f(focal length) = 0.34 mm, Fno = 1.20, FOV = 121.8deg. sur- Curvature Thick- Mat- In- Abbe Focal face Radius ness erialdex # length 0 object infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.010 3 Lens 1 −0.504 (ASP) 0.385 plastic 1.54 56−0.72 4 2.208 (ASP) 0.414 5 stop infinity 0.017 6 Lens 2 1.415 (ASP)0.508 plastic 1.54 56 0.76 7 −0.510 (ASP) 0.030 8 Lens 3 60.243 (ASP)0.355 plastic 1.54 56 1.23 9 −0.676 (ASP) 0.472 10  IR- infinity 0.210glass 1.52 54.5 filter 11  infinity infinity 12  Image infinity 0.000plane

TABLE 8 Aspheric Coefficients surface 3 4 6 7 8 9 K: −8.9574E+00−1.8655E+01 −3.0573E+02 −1.2575E+00 1.5715E+02 −1.2220E−01 A: 1.5447E+001.4497E+01 2.8808E+00 2.9669E+00 4.5606E+00 2.2079E+00 B: −4.6133E+00−2.1546E+02 −1.4255EE+01 −3.1094E+01 −3.4642E+01 −9.0007E+00 C:9.5150E+00 3.1999E+03 −5.6413E+02 5.3776E+01 4.2944E+01 1.2699E+02 D:−1.2115E+02 −1.5598E+04 6.5379E+03 −1.7586E+02 4.0062E+02 −1.0281E+03 E:8.6388E+00 −1.3702E+05 5.4097E+04 4.6999E+03 1.8345E+03 4.3686E+03 F−2.6923E+00 1.8193E+06 −1.5332E+06 −3.1483E+04 −3.1188E+04 −1.0830E+04 G7.1730E−02 −5.3407E+06 7.6274E+06 5.9102E+04 7.4691E+04 1.2056E+04

In the fourth embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the fourth embodiment, so an explanationin this regard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

Embodiment 4 f[mm] 0.34 f1/R2 −0.33 Fno 1.20 f2/R3 0.54 FOV[deg.] 121.80f2/R4 −1.49 |f/(f1 * f2 * f3)| 0.51 f3/R5 0.02 f/f1 −0.48 f3/R6 −1.82f/f2 0.45 R1/R2 −0.23 f/f3 0.28 R3/R4 −2.78 f/f23 0.60 R5/R6 −89.08f1/f23 −1.26 OTL/f 14.38 f1/R1 1.42 (f1 + f2 + f3)/(f1 * f2 * f3) −1.90

Referring to FIGS. 5A, 5B and FIG. 5C, FIG. 5A shows a three-piececompact optical lens system in accordance with a fifth embodiment of thepresent invention, FIG. 5B is a partial enlarged view of FIG. 5A, andFIG. 5C shows, in order from left to right, the image plane curve andthe distortion curve of the fifth embodiment of the present invention. Athree-piece compact optical lens system in accordance with the fifthembodiment of the present invention comprises, in order from an objectside to an image side: a flat panel 560, a first lens element 510, astop 500, a second lens element 520, a third lens element 530, an IR cutfilter 570, and an image plane 580, wherein the three-piece compactoptical lens system has a total of three lens elements with refractivepower. The stop 500 is disposed between the first lens element 510 andthe second lens element 520.

The flat panel 560 made of glass is located between an object O and thefirst lens element 510 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 510 with a negative refractive power has anobject-side surface 511 being concave near an optical axis 590 and animage-side surface 512 being convex near the optical axis 590, theobject-side surface 511 and the image-side surface 512 are aspheric, andthe first lens element 510 is made of plastic material.

The second lens element 520 with a positive refractive power has anobject-side surface 521 being convex near the optical axis 590 and animage-side surface 522 being convex near the optical axis 590, theobject-side surface 521 and the image-side surface 522 are aspheric, andthe second lens element 520 is made of plastic material.

The third lens element 530 with a positive refractive power has anobject-side surface 531 being convex near the optical axis 590 and animage-side surface 532 being convex near the optical axis 590, theobject-side surface 531 and the image-side surface 532 are aspheric, andthe third lens element 530 is made of plastic material.

The IR cut filter 570 made of glass is located between the third lenselement 530 and the image plane 580 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the fifth embodiment is shown in table 9,and the aspheric surface data is shown in table 10.

TABLE 9 Embodiment 5 f(focal length) = 0.39 mm, Fno = 1.40, FOV = 108.3deg. sur- Curvature Thick- Mat- In- Abbe Focal face Radius ness erialdex # length 0 object infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.565 3 Lens 1 −0.664 (ASP) 0.409 plastic 1.54 56−1.38 4 −6.569 (ASP) 0.391 5 stop infinity 0.016 6 Lens 2 0.835 (ASP)0.364 plastic 1.54 56 0.71 7 −0.621 (ASP) 0.034 8 Lens 3 2.073 (ASP)0.240 plastic 1.64 22.5 1.25 9 −1.274 (ASP) 0.392 10  IR- infinity 0.210glass 1.52 54.5 filter 11  infinity infinity 12  Image infinity 0.000plane

TABLE 10 Aspheric Coefficients surface 3 4 6 7 8 9 K: −5.7238E+00−4.0067E+02 −5.2904E+01 8.2614E−01 −1.0481E+02 −4.2865E+01 A: 2.0697E+005.3198E+00 5.3103E+00 3.6295E−02 8.3613E−01 1.8141E+00 B: −6.5342E+004.9908E+00 −6.2975E+01 −3.9570E+01 −4.8414E+01 −2.8553E+01 C: 1.4819E+012.3533E+02 −4.3756E+02 2.3037E+02 1.4503E+02 1.8849E+01 D: −1.8750E+01−2.6669E+03 9.9371E+03 7.9640E+02 1.1648E+03 5.0107E+02 E: 8.6757E+00−1.0270E+04 8.0681E+04 8.9252E+02 −2.4243E+02 4.0494E+03 F 5.0286E+002.4881E+05 −1.9089E+06 −5.9985E+04 −7.7409E+04 −4.8657E+04 G −4.9380E+00−5.7851E+05 7.8503E+06 1.7726E+05 2.7741E+05 1.1330E+05

In the fifth embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the fifth embodiment, so an explanation inthis regard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

Embodiment 5 f[mm] 0.39 f1/R2 0.21 Fno 1.40 f2/R3 0.85 FOV[deg.] 108.30f2/R4 −1.15 |f/(f1 * f2 * f3)| 0.32 f3/R5 0.60 f/f1 −0.28 f3/R6 −0.98f/f2 0.55 R1/R2 0.10 f/f3 0.31 R3/R4 −1.34 f/f23 0.76 R5/R6 −1.63 f1/f23−2.68 OTL/f 13.08 f1/R1 2.08 (f1 + f2 + f3)/(f1 * f2 * f3) −0.47

Referring to FIGS. 6A, 6B and FIG. 6C, FIG. 6A shows a three-piececompact optical lens system in accordance with a sixth embodiment of thepresent invention, FIG. 6B is a partial enlarged view of FIG. 6A, andFIG. 6C shows, in order from left to right, the image plane curve andthe distortion curve of the sixth embodiment of the present invention. Athree-piece compact optical lens system in accordance with the sixthembodiment of the present invention comprises, in order from an objectside to an image side: a flat panel 660, a first lens element 610, astop 600, a second lens element 620, a third lens element 630, an IR cutfilter 670, and an image plane 680, wherein the three-piece compactoptical lens system has a total of three lens elements with refractivepower. The stop 600 is disposed between the first lens element 610 andthe second lens element 620.

The flat panel 660 made of glass is located between an object O and thefirst lens element 610 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 610 with a negative refractive power has anobject-side surface 611 being concave near an optical axis 690 and animage-side surface 612 being concave near the optical axis 690, theobject-side surface 611 and the image-side surface 612 are aspheric, andthe first lens element 610 is made of plastic material.

The second lens element 620 with a positive refractive power has anobject-side surface 621 being convex near the optical axis 690 and animage-side surface 622 being convex near the optical axis 690, theobject-side surface 621 and the image-side surface 622 are aspheric, andthe second lens element 620 is made of plastic material.

The third lens element 630 with a positive refractive power has anobject-side surface 631 being concave near the optical axis 690 and animage-side surface 632 being convex near the optical axis 690, theobject-side surface 631 and the image-side surface 632 are aspheric, andthe third lens element 630 is made of plastic material.

The IR cut filter 670 made of glass is located between the third lenselement 630 and the image plane 680 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the sixth embodiment is shown in table 11,and the aspheric surface data is shown in table 12.

TABLE 11 Embodiment 6 f(focal length) = 0.41 mm, Fno = 1.50, FOV = 108.4deg. sur- Curvature Thick- Mat- In- Abbe Focal face Radius ness erialdex # length 0 object infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.335 3 Lens 1 −0.853 (ASP) 0.376 plastic 1.54 56−1.02 4 1.820 (ASP) 0.377 5 stop infinity 0.012 6 Lens 2 0.971 (ASP)0.294 plastic 1.64 22.5 0.71 7 −0.756 (ASP) 0.030 8 Lens 3 −3.590 (ASP)0.247 plastic 1.64 22.5 1.12 9 −0.614 (ASP) 0.446 10  IR- infinity 0.210glass 1.52 54.5 filter 11  infinity infinity 12  Image infinity 0.000plane

TABLE 12 Aspheric Coefficients surface 3 4 6 7 8 9 K: −2.2346E+00−4.8511E+02 −1.1408E+02 2.4188E−01 −1.9012E+01 −2.1609E+00 A: 2.9713E+005.3750E+00 7.4884E+00 1.5791E+00 2.3434E+00 2.3264E+00 B: −1.1069E+015.7163E+00 −1.0708E+02 −7.1289E+01 −5.7222E+01 −2.7097E+01 C: 3.1272E+015.5173E+02 −9.3982E+02 5.5065E+02 3.4089E+02 1.1892E+02 D: −5.0186E+01−6.4911E+03 2.5277E+04 2.3419E+03 2.9363E+03 1.2778E+03 E: 2.8950E+01−3.6649E+04 2.6515E+05 −3.3832E+03 2.4960E+03 1.0108E+04 F 2.0721E+019.3083E+05 −7.3370E+06 −3.0990E+05 −3.4077E+05 −2.1811E+05 G −2.5192E+01−3.5967E+06 3.4937E+07 9.6920E+05 1.1034E+06 6.7718E+05

In the sixth embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the sixth embodiment, so an explanation inthis regard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

Embodiment 6 f[mm] 0.41 f1/R2 −0.56 Fno 1.50 f2/R3 0.73 FOV[deg.] 108.40f2/R4 −0.94 |f/(f1 * f2 * f3)| 0.51 f3/R5 −0.31 f/f1 −0.40 f3/R6 −1.82f/f2 0.57 R1/R2 −0.47 f/f3 0.36 R3/R4 −1.28 f/f23 0.79 R5/R6 5.85 f1/f23−1.97 OTL/f 11.88 f1/R1 1.19 (f1 + f2 + f3)/(f1 * f2 * f3) −1.01

Referring to FIGS. 7A, 7B and FIG. 7C, FIG. 7A shows a three-piececompact optical lens system in accordance with a seventh embodiment ofthe present invention, FIG. 7B is a partial enlarged view of FIG. 7A,and FIG. 7C shows, in order from left to right, the image plane curveand the distortion curve of the seventh embodiment of the presentinvention. A three-piece compact optical lens system in accordance withthe seventh embodiment of the present invention comprises, in order froman object side to an image side: a flat panel 760, a first lens element710, a stop 700, a second lens element 720, a third lens element 730, anIR cut filter 770, and an image plane 780, wherein the three-piececompact optical lens system has a total of three lens elements withrefractive power. The stop 700 is disposed between the first lenselement 710 and the second lens element 720.

The flat panel 760 made of glass is located between an object O and thefirst lens element 710 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 710 with a negative refractive power has anobject-side surface 711 being concave near an optical axis 790 and animage-side surface 712 being concave near the optical axis 790, theobject-side surface 711 and the image-side surface 712 are aspheric, andthe first lens element 710 is made of plastic material.

The second lens element 720 with a positive refractive power has anobject-side surface 721 being convex near the optical axis 790 and animage-side surface 722 being convex near the optical axis 790, theobject-side surface 721 and the image-side surface 722 are aspheric, andthe second lens element 720 is made of plastic material.

The third lens element 730 with a positive refractive power has anobject-side surface 731 being convex near the optical axis 790 and animage-side surface 732 being convex near the optical axis 790, theobject-side surface 731 and the image-side surface 732 are aspheric, andthe third lens element 730 is made of plastic material.

The IR cut filter 770 made of glass is located between the third lenselement 730 and the image plane 780 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the seventh embodiment is shown in table13, and the aspheric surface data is shown in table 14.

TABLE 13 Embodiment 7 f(focal length) = 0.36 mm, Fno = 1.20, FOV = 129.4deg. sur- Curvature Thick- Mat- In- Abbe Focal face Radius ness erialdex # length 0 object infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.028 3 Lens 1 −0.489 (ASP) 0.265 plastic 1.54 56−0.71 4 2.118 (ASP) 0.498 5 stop infinity −0.014 6 Lens 2 0.887 (ASP)0.414 plastic 1.54 56 1.11 7 −1.573 (ASP) 0.034 8 Lens 3 1.496 (ASP)0.367 plastic 1.54 56 0.78 9 −0.544 (ASP) 0.504 10  IR- infinity 0.210glass 1.52 54.5 filter 11  infinity infinity 12  Image infinity 0.000plane

TABLE 14 Aspheric Coefficients surface 3 4 6 7 8 9 K: −1.0288E+012.9716E+00 −3.9551E+01 8.7948E+00 −1.1155E+02 2.5315E−02 A: 2.2526E+001.0575E+01 2.4959E+00 1.4729E−01 2.7440E+00 6.0590E−01 B: −7.2346E+00−8.1161E+01 1.2231E+01 −5.7392E+00 −3.3256E+01 2.4679E+01 C: 1.4705E+011.1763E+03 −7.4918E+02 4.7381E+00 1.0577E+02 −1.1530E+02 D: −1.6762E+01−7.4568E+03 3.8984E+03 −6.0267E+02 3.2770E+02 −2.8869E+02 E: 8.4455E+00−2.1681E+04 9.6229E+04 4.3158E+03 1.4087E+03 6.3091E+03 F 7.5050E−014.7807E+05 −1.4250E+06 −1.5818E+04 −5.3255E+04 −2.8925E+04 G −1.7802E+00−1.4468E+06 5.4193E+06 2.5578E+04 1.6613E+05 4.5475E+04

In the seventh embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the seventh embodiment, so an explanationin this regard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

Embodiment 7 f[mm] 0.36 f1/R2 −0.33 Fno 1.20 f2/R3 1.25 FOV[deg.] 129.40f2/R4 −0.70 |f/(f1 * f2 * f3)| 0.59 f3/R5 0.52 f/f1 −0.51 f3/R6 −1.44f/f2 0.32 R1/R2 −0.23 f/f3 0.46 R3/R4 −0.56 f/f23 0.62 R5/R6 −2.75f1/f23 −1.21 OTL/f 13.39 f1/R1 1.44 (f1 + f2 + f3)/(f1 * f2 * f3) −1.94

Referring to FIGS. 8A, 8B and FIG. 8C, FIG. 8A shows a three-piececompact optical lens system in accordance with a eighth embodiment ofthe present invention, FIG. 8B is a partial enlarged view of FIG. 8A,and FIG. 8C shows, in order from left to right, the image plane curveand the distortion curve of the eighth embodiment of the presentinvention. A three-piece compact optical lens system in accordance withthe eighth embodiment of the present invention comprises, in order froman object side to an image side: a flat panel 860, a first lens element810, a stop 800, a second lens element 820, a third lens element 830, anIR cut filter 870, and an image plane 880, wherein the three-piececompact optical lens system has a total of three lens elements withrefractive power. The stop 800 is disposed between the first lenselement 810 and the second lens element 820.

The flat panel 860 made of glass is located between an object 0 and thefirst lens element 810 and has no influence on the focal length of thethree-piece compact optical lens system.

The first lens element 810 with a negative refractive power has anobject-side surface 811 being concave near an optical axis 890 and animage-side surface 812 being concave near the optical axis 890, theobject-side surface 811 and the image-side surface 812 are aspheric, andthe first lens element 810 is made of plastic material.

The second lens element 820 with a positive refractive power has anobject-side surface 821 being convex near the optical axis 890 and animage-side surface 822 being convex near the optical axis 890, theobject-side surface 821 and the image-side surface 822 are aspheric, andthe second lens element 820 is made of plastic material.

The third lens element 830 with a positive refractive power has anobject-side surface 831 being convex near the optical axis 890 and animage-side surface 832 being convex near the optical axis 890, theobject-side surface 831 and the image-side surface 832 are aspheric, andthe third lens element 830 is made of plastic material.

The IR cut filter 870 made of glass is located between the third lenselement 830 and the image plane 880 and has no influence on the focallength of the three-piece compact optical lens system.

The detailed optical data of the eighth embodiment is shown in table 15,and the aspheric surface data is shown in table 16.

TABLE 15 Embodiment 8 f(focal length) = 0.39 mm, Fno = 1.60, FOV = 111.0deg. sur- Curvature Thick- Mat- In- Abbe Focal face Radius ness erialdex # length 0 pbject infinity 0.000 1 flat infinity 1.500 glass 1.5264.2 panel 2 infinity 1.192 3 Lens 1 −0.862 (ASP) 0.267 plastic 1.6452.5 −0.92 4 2.251 (ASP) 0.413 5 stop infinity 0.023 6 Lens 2 1.124(ASP) 0.391 plastic 1.54 56 1.06 7 −1.060 (ASP) 0.115 8 Lens 3 0.353(ASP) 0.264 plastic 1.54 56 0.81 9 1.280 (ASP) 0.337 10  IR- infinity0.145 glass 1.52 54.5 filter 11  infinity infinity 12  Image infinity0.000 plane

TABLE 16 Aspheric Coefficients surface 3 4 6 7 8 9 K: −1.0334E+01−3.2949E+02 −6.5202E+01 2.7538E+00 −3.9237E−01 4.8950E+00 A: 2.3249E+006.4379E+00 −3.1459E−01 −1.0773E+01 −9.2564E+00 3.8193E+00 B: −5.4793E+00−2.9503E+00 7.7474E+00 6.4661E+01 8.2212E+01 −4.3656E+01 C: 8.8566E+004.9837E+01 −4.4062E+02 −1.0320E+02 −1.0312E+03 9.7123E+01 D: −5.9101E+004.4457E+02 9.0463E+03 −1.4259E+03 5.8260E+03 −7.6089E+01 E: 2.3959E−03−1.7922E+03 −2.8651E+05 4.1769E+03 −1.5877E+04 1.0505E+02 F 7.0452E−01−2.6077E+03 3.0193E+06 −1.9325E+03 8.8566E+03 −6.6612E+02 G 9.6205E−03−5.9073E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

In the eighth embodiment, the equation of the aspheric surface profilesof the aforementioned lens elements is the same as the equation of thefirst embodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the first embodimentwith corresponding values for the eighth embodiment, so an explanationin this regard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

Embodiment 8 f[mm] 0.39 f1/R2 −0.41 Fno 1.60 f2/R3 0.95 FOV[deg.] 111.00f2/R4 −1.00 |f/(f1 * f2 * f3)| 0.49 f3/R5 2.29 f/f1 −0.42 f3/R6 0.63f/f2 0.36 R1/R2 −0.38 f/f3 0.48 R3/R4 −1.06 f/f23 0.76 R5/R6 0.28 f1/f23−1.81 OTL/f 12.02 f1/R1 1.07 (f1 + f2 + f3)/(f1 * f2 * f3) −1.20

In the present three-piece compact optical lens system, the lenselements can be made of plastic or glass. If the lens elements are madeof plastic, the cost will be effectively reduced. If the lens elementsare made of glass, there is more freedom in distributing the refractivepower of the three-piece compact optical lens system. Plastic lenselements can have aspheric surfaces, which allow more design parameterfreedom (than spherical surfaces), so as to reduce the aberration andthe number of the lens elements, as well as the total track length ofthe three-piece compact optical lens system.

In the present three-piece compact optical lens system, if theobject-side or the image-side surface of the lens elements withrefractive power is convex and the location of the convex surface is notdefined, the object-side or the image-side surface of the lens elementsnear the optical axis is convex. If the object-side or the image-sidesurface of the lens elements is concave and the location of the concavesurface is not defined, the object-side or the image-side surface of thelens elements near the optical axis is concave.

While we have shown and described various embodiments in accordance withthe present invention, it should be clear to those skilled in the artthat further embodiments may be made without departing from the scope ofthe present invention.

What is claimed is:
 1. A three-piece compact optical lens system, inorder from an object side to an image side, comprising: a flat panelmade of glass; a first lens element with a negative refractive power,having an object-side surface being concave near an optical axis, atleast one of the object-side surface and an image-side surface of thefirst lens element being aspheric; a stop; a second lens element with apositive refractive power, having an object-side surface being convexnear an optical axis and an image-side surface being convex near theoptical axis, at least one of the object-side surface and the image-sidesurface of the second lens element being aspheric; and a third lenselement with a positive refractive power, at least one of an object-sidesurface and an image-side surface of the third lens element beingaspheric; wherein the three-piece compact optical lens system has atotal of three lens elements with refractive power, the three-piececompact optical lens system has a maximum view angle FOV, a distancefrom an object to an image plane along the optical axis is OTL, a focallength of the three-piece compact optical lens system is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, andthey satisfy the relations: 90 degrees <FOV<140 degrees; 2 mm <OTL<6 mm;0.2<−f/(f1*f2*f3)|<0.7.
 2. The three-piece compact optical lens systemas claimed in claim 1, wherein the focal length of the three-piececompact optical lens system is f, the focal length of the first lenselement is f1, and they satisfy the relation: −0.7<f/f1<−0.1.
 3. Thethree-piece compact optical lens system as claimed in claim 1, whereinthe focal length of the three-piece compact optical lens system is f,the focal length of the second lens element is f2, and they satisfy therelation: 0.1<f/f2<0.75.
 4. The three-piece compact optical lens systemas claimed in claim 1, wherein the focal length of the three-piececompact optical lens system is f, the focal length of the third lenselement is f3, and they satisfy the relation: 0.07<f/f3<0.68.
 5. Thethree-piece compact optical lens system as claimed in claim 1, whereinthe focal length of the three-piece compact optical lens system is f, afocal length of the second lens element and the third lens elementcombined is f23, and they satisfy the relation: 0.4<f/f23<1.0.
 6. Thethree-piece compact optical lens system as claimed in claim 1, whereinthe focal length of the first lens element is f1, a focal length of thesecond lens element and the third lens element combined is f23, and theysatisfy the relation: −2.9<f1/f23<−1.0.
 7. The three-piece compactoptical lens system as claimed in claim 1, wherein the focal length ofthe first lens element is f1, a radius of curvature of the object-sidesurface of the first lens element is R1, and they satisfy the relation:0.6<f1/R1<2.4.
 8. The three-piece compact optical lens system as claimedin claim 1, wherein the focal length of the first lens element is f1, aradius of curvature of the image-side surface of the first lens elementis R2, and they satisfy the relation: −1.0<f1/R2<0.6.
 9. The three-piececompact optical lens system as claimed in claim 1, wherein the focallength of the second lens element is f2, a radius of curvature of theobject-side surface of the second lens element is R3, and they satisfythe relation: 0.2<f2/R3<1.6.
 10. The three-piece compact optical lenssystem as claimed in claim 1, wherein the focal length of the secondlens element is f2, a radius of curvature of the image-side surface ofthe second lens element is R4, and they satisfy the relation:−1.8<f2/R4<−0.4.
 11. The three-piece compact optical lens system asclaimed in claim 1, wherein the focal length of the third lens elementis f3, a radius of curvature of the object-side surface of the thirdlens element is R5, and they satisfy the relation: −0.7<f3/R5<2.7. 12.The three-piece compact optical lens system as claimed in claim 1,wherein the focal length of the third lens element is f3, a radius ofcurvature of the image-side surface of the third lens element is R6, andthey satisfy the relation: −2.1<f3/R6<1.0.
 13. The three-piece compactoptical lens system as claimed in claim 1, a radius of curvature of theobject-side surface of the first lens element is R1, a radius ofcurvature of the image-side surface of the first lens element is R2, andthey satisfy the relation: −0.9<R1/R2<0.6.
 14. The three-piece compactoptical lens system as claimed in claim 1, a radius of curvature of theobject-side surface of the second lens element is R3, a radius ofcurvature of the image-side surface of the second lens element is R4,and they satisfy the relation: −3.2<R3/R4<−0.1.
 15. The three-piececompact optical lens system as claimed in claim 1, a radius of curvatureof the object-side surface of the third lens element is R5, a radius ofcurvature of the image-side surface of the third lens element is R6, andthey satisfy the relation: −95<R5/R6<10.
 16. The three-piece compactoptical lens system as claimed in claim 1, the focal length of thethree-piece compact optical lens system is f, the distance from theobject to the image plane along the optical axis is OTL, and theysatisfy the relation: 8.0<OTL/f<18.0.
 17. The three-piece compactoptical lens system as claimed in claim 1, the focal length of the firstlens element is f1, the focal length of the second lens element is f2,the focal length of the third lens element is f3, and they satisfy therelation: −2.4<(f1+f2+f3)/(f1*f2*f3)<−0.1.